That said, standard names don't include every possible color.

What if we want to use burnt orange? That's when hexadecimal colors come in handy.

<html>
 <head><style>.box {color: #fff;background-color: #bf5700;}</style>
</head><body><div class="box">Hook 'em!</div></body>
</html>
]]>

Hexadecimal colors are common on the Web. They start with a hash symbol and have three or six digits.

Not quite! Hexadecimal colors start with a hash symbol.